....in the case of the Mo-Bass (which I own ), it means you may run the amplifier in a mode which combines the 2 stereo outputs into one, more powerful single channel amp.

The Mo runs at 250 watts/side @ 8 ohms, running it in bridged mode you get 900 watts/4ohms output in a single channel mode. It's important to observe and obey the posted minimum ohms , which is 4 ohms.

I use the Mo in bridged mode pushing a SWR Goliath sr (6-10's) ....with really good results.